3.1 treatment of roof rainwater recycling
Generally speaking, there are two ways to recycle roof rainwater. One is to plant green plants on the ground, which can effectively use rainwater. The roots of green plants buried in the soil need to absorb water, which can effectively reduce the runoff and peak value of rainwater on the roof. At the same time, rainwater can also play a certain purification role through the soil to ensure the quality of rainwater and prevent the infiltration of roof water. On the other hand, it expands the urban green area and can effectively protect the environment. Planting green plants on the roof can keep warm and insulate heat, and improve the living comfort. Special attention should be paid to the choice of building materials with strong waterproof ability and bearing capacity when collecting rainwater on the roof by this method. After collecting rainwater, it is discharged through a special rainwater drainage pipeline to play an environmental protection and energy saving role. At the same time, rainwater irrigation of plants is also one of the important links in the water cycle.
the second method is to install the rainwater collection and treatment system on the roof, and filter and disinfect the collected rainwater by using coagulant and other substances, and the excess rainwater will flow into the overflow pipe and finally into the rainwater regulating tank for recycling.
3.2 permeable treatment of residential ground
Laying the residential ground with permeable bricks can better improve the rainwater recovery and utilization rate. When buying permeable bricks, attention should also be paid to the permeability of masonry, and laying should be scientific and reasonable, so that rainwater can penetrate into the ground smoothly and replenish groundwater resources. The use of ground permeable bricks can well avoid the impact of ground hardening on the imbalance of water resources ecosystem in the community. In addition, it is necessary to choose silica sand bricks and water collecting pipes to build a systematic rainwater recycling system for residential areas. The rainwater on the ground is collected, treated and finally put into use. Different communities think that different geological conditions such as geographical location are different, and the groundwater level and distribution are also different. Therefore, when laying permeable bricks, different auxiliary materials and paving techniques need to be selected according to the actual conditions to ensure the water permeability effect to the extreme.
3.3 rainwater recycling in green plants and shallow ditches
Some green plant planting areas will be designed in the community. The shallow surface ditch in the residential area can achieve the effect of water storage and drainage by planting vegetation, and can also purify rainwater. Setting rainwater collection channels in the residential area can be connected with urban rainwater pipes to discharge runoff rainwater in time. The concave green space has the same effect as shallow ditch vegetation. The concave green space is a natural rainwater infiltration facility, which accelerates rainwater infiltration at the source and avoids the flood problem caused by rainwater accumulation.
3.4 multifunctional landscape pools and reservoirs
With the development of economy, people's living standards have been improved to a certain extent, and there will be fewer multifunctional landscape pools or reservoirs in the community, which will facilitate rainwater collection, improve the quality of collected rainwater for centralized purification, improve the utilization rate of water resources and reduce the cost of water use. However, we should also pay attention to the protection of landscape and ecological environment, build green residential quarters and maintain a good living environment. The design of the residential area should be considered from the overall perspective, not only to be beautiful, but also to ensure complete functions and unique skills, which can improve the quality of the rainwater recycling system in the residential area.